Fix test for GT_INDEX_ADDR to forcibly compile with minopts

[AndyAyersMS]

Update test introduced in #20047 so that the key method ReadByte is compiled
with minopts by default.

[AndyAyersMS]

@briansull PTAL
cc @dotnet/jit-contrib

Somewhat surprisingly a method marked as NoOptimization can still be inlined (and the inline copy optimized). So we have to set both the NoOptimization and NoInlining attribute bits here.

This is a consequence of the way that no optimization info is passed to the jit -- via jit flags rather than by checking the method impl attributes.

(Will port this over to 2.2 as well, to fix up the copy of the test added via #20127)

[erozenfeld]

LGTM

[AndyAyersMS]

Just a test update, so am going to ignore unrelated failures and legs that never finish.